Fat elephant struggles to save bacteria colony | Photo courtesy of Twentieth Century Fox To no one's surprise, Horton Hears a Who swamped the box office this weekend with a year's best $45.1M. It easily out-distanced 10,000 B.C. which managed to bring in an additional $16.4M ($61.2M) in its second weekend. Newcomer Never Back Down surprised to the high side with a take of $8.6M followed by hold-overs College Road Trip ($7.8M/$24.2M), Vantage Point......